CN1878391A - Random access channel distribution and access method - Google Patents
Random access channel distribution and access method Download PDFInfo
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- CN1878391A CN1878391A CNA2005100749533A CN200510074953A CN1878391A CN 1878391 A CN1878391 A CN 1878391A CN A2005100749533 A CNA2005100749533 A CN A2005100749533A CN 200510074953 A CN200510074953 A CN 200510074953A CN 1878391 A CN1878391 A CN 1878391A
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Abstract
The invention relates to a method for distributing random access signal channel, which comprises: when distributing random access signal channel for the present wireless frame, if the random access signal channels of present frame and front frame are the same, in effective time gap, setting the ULMAP of present wireless frame without random access IE and setting the DLFP of wireless frame to represent that said frame contains random access signal channel; then sending out the set wireless frame. The inventive access method of random access signal channel: SS, based on received DLFP of wireless frame, judges that the received one is the wireless frame sent by the inventive distribute method, according to the random access IE received latest, to find the random access signal channel present wireless frame, and access into said random access signal channel. The invention can solve the abundant problem when accessing into IE randomly.
Description
Technical field
The present invention relates to the wireless data access technical field, be meant the distribution and the cut-in method of Random Access Channel especially.
Background technology
IEEE802.16 is the wireless data access technical standard of a kind of point-to-multipoint of IEEE tissue definition.The system of IEEE802.16 definition is made up of base station (BS) and a plurality of user terminal (SS).Be that unit communicates with the radio frames between BS and the SS.Each radio frames is made up of sub-frame of uplink and descending sub frame.At the place that begins of each descending sub frame, BS notifies current ascending-descending subframes channel resource how to distribute between a plurality of SS by sending DLMAP (downlink map) and ULMAP (uplink map) message to SS.Comprise a plurality of cells (IE, InformationElement in the DLMAP/ULMAP message; For the convenience of describing, the IE in DLMAP message and the ULMA message is designated as DLMAP_IE and ULMAP_IE respectively).Each DLMAP_IE/ULMAP_IE correspondence is descending/a burst Resource Block (burst) in the sub-frame of uplink.DLMAP_IE can be used to indicate the code modulation mode and the position of this burst in descending sub frame of data among the corresponding burst; ULMAP_IE can be used to indicate corresponding burst how to be used by SS, comprises code modulation mode and the position of this burst in sub-frame of uplink.
Wireless frame structure schematic diagram referring under the tdd mode shown in Fig. 1 shows the relation between DLMAP, ULMAP and the uplink/downlink frames.
In order to allow new SS to insert BS, common ULMAP can indicate a part of burst resource in the sub-frame of uplink to be specifically designed to new SS and send up access message.This part burst resource is commonly referred to as Random Access Channel, and the IE of corresponding this burst of indication is called and inserts IE at random.
Because randomness and uncertainty that user terminal SS inserts almost all will be distributed Random Access Channel in each sub-frame of uplink.Therefore, correspondingly, almost in each sub-frame of uplink, all have and insert IE at random.
According to the regulation of prior art,, just must in ULMAP, have and insert IE (foregoing ULMAP_IE) accordingly at random and indicate if on a frame Random Access Channel is arranged.Ought exist under the situation of continuous a plurality of frames like this, Random Access Channel continuous multiple frames may be all constant always (in most cases, Random Access Channel can frequent variations), however, also will be provided with on each frame and insert IE at random and indicate, the redundancy that inserts IE has at random caused the waste of interface-free resources.
Summary of the invention
In view of this, main purpose of the present invention has been to provide the distribution and the cut-in method of Random Access Channel, to solve the redundancy issue that inserts IE at random.
The distribution method of Random Access Channel provided by the invention may further comprise the steps:
A1, judge whether to the sub-frame of uplink of current wireless frame distributes Random Access Channel, if, execution in step B1 then;
If not, then be provided with among the uplink map ULMAP of current wireless frame and do not comprise the cell of the access at random IE that is used to indicate described Random Access Channel, and a specified byte in the present frame is set represents that the sub-frame of uplink of this radio frames is unallocated Random Access Channel, execution in step C1 arranged;
B1, judge whether the Random Access Channel of the current wireless frame and the sub-frame of uplink of radio frames last time is identical, if not, then be provided with among the ULMAP of current wireless frame and comprise the described IE that inserts at random;
If then be provided with among the uplink map ULMAP of current wireless frame and do not comprise the IE of access at random that is used to indicate described Random Access Channel, and specified byte described in the present frame is set represents that the sub-frame of uplink of this radio frames is assigned Random Access Channel;
C1, the radio frames that sets is sent by wireless channel.
Wherein, when the Random Access Channel of the described judgement current wireless of the step B1 frame and the sub-frame of uplink of radio frames last time is identical, further comprise: whether the time interval that judge to send the current wireless frame and send radio frames last time is in the effective time of setting, if then continue current step; Otherwise, be provided with among the ULMAP of current wireless frame and comprise described IE, the execution in step C1 of inserting at random.
Wherein, described specified byte adopts different values to represent the following different situations of the sub-frame of uplink of current wireless frame respectively: unallocated Random Access Channel; Only distributed the Random Access Channel that is used for periodically adjustment or bandwidth request; Only distributed the Random Access Channel that is used for initial random access; Promptly distributed the Random Access Channel that is used for initial random access to distribute again to be used for and periodically adjusted or the Random Access Channel of bandwidth request.
Wherein, described specified byte is the byte among the DLEP.Further, the byte among the described DLEP is two bits of the reserve bytes of DLEP.
The cut-in method of the Random Access Channel that the present invention provides accordingly, SS receives the radio frames of BS, and is further comprising the steps of:
Whether comprise among the ULMAP of the radio frames that A6, judgement receive and insert IE at random, if not, execution in step B6; If, then insert the Random Access Channel that IE determines the sub-frame of uplink of this radio frames at random according to described, and buffer memory this insert IE, execution in step C6 at random;
B6, judge whether the specified byte in the present frame represents that the sub-frame of uplink of this radio frames is assigned Random Access Channel, if then insert the Random Access Channel that IE determines the sub-frame of uplink of current wireless frame at random according to buffer memory; Otherwise process ends;
C6, SS are with in the described Random Access Channel access wireless channel of determining.
Wherein, this radio frames sub-frame of uplink of representing of described specified byte Random Access Channel of distributing is: be used for periodically adjusting or the Random Access Channel of bandwidth request; The IE of access at random of described buffer memory is: indication is used for the IE of access at random of the Random Access Channel of periodically adjustment or bandwidth request; Perhaps,
The Random Access Channel that this radio frames sub-frame of uplink that described specified byte is represented distributes is: the Random Access Channel that is used for initial random access; The IE of access at random of described buffer memory is: indication is used for the IE of access at random of the Random Access Channel of initial random access; Perhaps,
The Random Access Channel that this radio frames sub-frame of uplink that described specified byte is represented distributes is: be used for the Random Access Channel of initial random access and be used for periodically adjusting or the Random Access Channel of bandwidth request; The IE of access at random of described buffer memory is: indication be used for initial random access Random Access Channel insert at random that IE and indication are used for periodically adjusting or the IE of access at random of the Random Access Channel of bandwidth request.
Wherein, described specified byte is the byte among the DLFP.Further, the byte among the described DLFP is two bits of the reserve bytes that comprises of DLFP.
Wherein, if the IE of access at random of buffer memory lost efficacy, step B6 is described during according to the inserting IE at random and determine the Random Access Channel of sub-frame of uplink of current wireless frame of buffer memory, handles according to the situation of the unallocated Random Access Channel of current wireless frame.
The distribution method of another kind of Random Access Channel provided by the invention, this method may further comprise the steps:
A11, judge whether the Random Access Channel of the sub-frame of uplink that current wireless frame and radio frames are last time distributed is identical, if the IE of access at random that does not comprise described Random Access Channel correspondence among the ULMAP of current wireless frame then is set; Otherwise comprise the described IE that inserts at random;
B11, according to the setting of steps A 11, the specified byte in the corresponding setting current wireless frame represents whether to comprise the described IE that inserts at random;
C11, the radio frames that sets is sent by wireless channel.
Wherein, when the Random Access Channel of the steps A 11 described judgement current wireless frames and the sub-frame of uplink of radio frames last time is identical, further comprise: whether the time interval that judge to send the current wireless frame and send radio frames last time is in the effective time of setting, if then continue current step; Otherwise be provided with among the ULMAP of current wireless frame and comprise described IE, the execution in step B11 of inserting at random.
Wherein, described specified byte is the byte among the DLFP.Further, the byte among the described DLFP is the reserve bytes that DLFP comprises.
The cut-in method of the another kind of Random Access Channel that provides accordingly, SS receives the radio frames of BS, and this method may further comprise the steps:
A15, judge whether to comprise in this radio frames according to the specified byte of present frame and insert IE at random;
If then insert IE at random and determine Random Access Channel in the current sub-frame of uplink and this Random Access Channel distribution condition of buffer memory according to this;
If not, then utilize the Random Access Channel distribution condition of buffer memory to determine Random Access Channel;
B15, SS are with in the described Random Access Channel access wireless channel of determining.
Wherein, if the Random Access Channel distribution condition of buffer memory lost efficacy, when steps A 15 described Random Access Channel distribution condition according to buffer memory are determined the Random Access Channel of sub-frame of uplink of current wireless frame, handle according to the situation of the unallocated Random Access Channel of current wireless frame.
Wherein, described specified byte is the byte among the DLFP.Further, the byte among the described DLFP is the reserve bytes that DLFP comprises.
By said method as can be seen, the present invention with the prerequisite of existing protocol operating such under, solve the redundancy issue that inserts IE at random.Specifically, when BS sends radio frames, if the Random Access Channel of present frame and frame last time is identical, and in certain time interval, then in ULMAP, save and insert the IE field at random, and adopt the reserved field among the DLFP to represent whether this frame comprises Random Access Channel.Use this radio frames to send and to solve the redundancy that inserts IE at random, saved radio channel resource.
Accordingly, when SS receives corresponding radio frames, when determining this frame and comprise Random Access Channel, adopt its IE of access at random that time receives recently to determine Random Access Channel and insert according to the reserved field among the DLFP.Guaranteed to use above-mentioned radio frames to realize the access of wireless channel.
Description of drawings
Fig. 1 is the wireless frame structure schematic diagram under the tdd mode.
Fig. 2 is the allocation flow figure of Random Access Channel of the present invention.
Fig. 3 is the access process figure of Random Access Channel of the present invention.
Embodiment
Consider as a rule, the Random Access Channel continuous multiple frames in addition all constant always (in most cases, Random Access Channel can frequent variations), the invention provides a kind of distribution, cut-in method of Random Access Channel, the distribution of described Random Access Channel is still carried out by BS, inserts Random Access Channel accordingly and is still carried out by SS.Below the present invention is described in detail.Need to prove that the present invention does not change the form that inserts IE at random, with the compatibility of the maximum of the radio channel allocation that realizes and prior art is stipulated, access way.
BS of the present invention carries out Random Access Channel and divides timing, whether sends the IE of access at random of indication Random Access Channel according to following rule decision:
1, in the sub-frame of uplink,, do not comprise among the ULMAP and insert IE at random if do not distribute Random Access Channel; If the distribution Random Access Channel might not comprise the corresponding IE of access at random among the ULMAP.
If it is different with the last distribution that the Random Access Channel of 2 present frames is distributed, then should comprise the IE of access at random that indicates this Random Access Channel among the ULMAP of present frame.
If 3 present frames sent from last time and insert at random between the frame of IE, surpass the T time of setting, then should send the corresponding IE of access at random.Wherein, the T time can be unit with the frame length, and disposes as system parameters.
If the Random Access Channel of 4 present frames is distributed and previous Random Access Channel is distributed just the samely, and present frame sends from last time and inserted at random between the frame of IE, is no more than the T time, and then present frame can not send the corresponding IE of access at random.
5, whether the indication present frame comprises Random Access Channel in downlink broadcast message.Wherein a kind of method is, in descending sub frame control prefix (DLFP), indicates, can be the form shown in the following table 1 with existing DLFP form modifying:
| Syntax | Size (bits) | Notes |
| DL_Frame_Prefix_Format(){ | - | - |
| Used | 6 | Bit #0：Subchannel group 0 Bit #1： |
| Ranging_Change_Indication | 1 | |
| | 2 | 0b00-No repetition coding on DL-MAP 0b01-Repetition coding of 2used on DL-MAP 0b10-Repetition coding of 4 used on DL-MAP 0b11-Repetition coding of 6 used on |
| DL- | ||
| Coding_Indication | ||
| 3 | 0b000：CC encoding used on DL-MAP 0b001：BTC encoding used on DL-MAP 0b010：CTC encoding used on DL-MAP 0b011：ZT CC used on DL-MAP 0b100：LDPC encoding used on DL-MAP 0b101 to 0b111-Reserved | |
| DL-MAP_Length | 8 | - |
| RRAI(Ranging_Region_ Allocation_Indication) | 2 | Bit #0：When Set，Initial Ranging Region is allocated. Bit #1：When Set，Periodical Ranging Region is allocated. |
| reserved | 2 | Shallbe set to zero. |
| } | - | - |
Table 1
Wherein, runic italics part for a change.Therefore the present invention utilizes preceding two of former 4 reservation bits (reserved) of withing a hook at the end to indicate in the present frames whether distributed Random Access Channel in DLFP.Specifically, the reserve bytes reserved among the former DLFP takies the 4bit byte, and after the modification, reserve bytes reserved takies the 2bit byte, and the 2bit byte is taken by RRAI (Ranging_Region_Allocation_Indication) byte that increases in addition.This RRAI is used to refer to two kinds of Random Access Channel.Below this byte is elaborated:
RRAI=00, unallocated Random Access Channel in the sub-frame of uplink of expression current wireless frame;
RRAI=10 has only distributed the Random Access Channel that is used for initial random access in the sub-frame of uplink of expression current wireless frame;
RRAI=01 has only distributed the Random Access Channel that is used for periodically adjustment or bandwidth request in the sub-frame of uplink of expression current wireless frame;
RRAI=11 has promptly distributed the Random Access Channel that is used for initial random access to distribute again in the sub-frame of uplink of expression current wireless frame to be used for and has periodically adjusted or the Random Access Channel of bandwidth request.
According to above-mentioned rule, the distribution method of Random Access Channel of the present invention can be set to following steps, describes referring to the flow chart shown in Fig. 2:
First step: BS determines whether to distribute Random Access Channel into the sub-frame of uplink of current wireless frame, if then carry out second step; Otherwise be provided with not comprise among the ULMAP of current wireless frame and insert IE at random, and the RRAI that the descending sub frame control prefix (DLFP) that present frame is set is comprised was 00 (being equivalent to DLFP not changed), the sub-frame of uplink of representing this frame does not comprise Random Access Channel, carries out third step.
Second step: whether the distribution of judging the current wireless frame and the described Random Access Channel of radio frames last time is identical, and whether the time interval T that sends present frame and send frame last time is in the effective time of setting, if, then be provided with not comprise among the ULMAP of current wireless frame and insert IE at random, and the RRAI that DLFP comprised that present frame is set is expressed as this frame and comprises Random Access Channel, can be set to 01 or 10 or 11 according to the situation RRAI of reality.
If the current wireless frame is different with the Random Access Channel that radio frames is last time distributed, the time interval T of frame exceeds the effective time of setting with sending last time perhaps to send present frame, then be provided with to comprise among the ULMAP of current wireless frame and insert IE (identical) at random, insert the Random Access Channel that sub-frame of uplink distributed that IE indicates present frame at random by this with the method for background technology.
Third step: the radio frames that sets is sent by wireless channel, to receive this radio frames by SS.
Be understood that, in above-mentioned second step, also can not comprise the factor of described time interval T.
The distribution method of corresponding above-mentioned Random Access Channel, when SS of the present invention carries out the access of wireless access channel, determine the Random Access Channel of the present frame of reception according to following rule:
Insert IE at random if having among the ULMAP of 1 present frame, then determine Random Access Channel in the current sub-frame of uplink, and this IE is stored, as reference in the future according to this IE.
If do not insert IE among the ULMAP in 2 present frames at random, then determine whether to have distributed Random Access Channel, if the IE of access at random that then utilizes the last time of storage to receive determines Random Access Channel at present frame according to the RRAI value among the DLFP.Specify below and how to determine according to RRAI:
Judge RRAI=00, unallocated Random Access Channel in the sub-frame of uplink of expression current wireless frame.
Judge RRAI=10, only distributed the Random Access Channel that is used for initial random access in the sub-frame of uplink of expression current wireless frame, and the distribution of Random Access Channel is the same with last sub-distribution, and the IE of access at random that the last time of utilization storage receives determines Random Access Channel.
Judge RRAI=01, only distributed the Random Access Channel that is used for periodically adjustment or bandwidth request in the sub-frame of uplink of expression current wireless frame, and the distribution of Random Access Channel is the same with last sub-distribution, and the IE of access at random that the last time of utilization storage receives determines Random Access Channel.
RRAI=11, promptly distributed the Random Access Channel that is used for initial random access to distribute again in the sub-frame of uplink of expression present frame radio frames to be used for and periodically adjusted or the Random Access Channel of bandwidth request, and the distribution of Random Access Channel is the same with last sub-distribution, and the IE of access at random that the last time of utilization storage receives determines Random Access Channel.
If do not insert IE among the ULMAP in 3 present frames at random, and the IE of access at random of not storage as a reference, can think that present frame does not have distribution to insert IE at random.
If 4 because of the abominable reason of channel circumstance, SS does not correctly receive ULMAP, and SS should think that accidental channel last time of storage distributes IE to lose efficacy, and should delete.
According to above-mentioned rule, the cut-in method of Random Access Channel of the present invention may further comprise the steps, and describes referring to the flow chart shown in Fig. 3:
First step: when SS receives radio frames, at first judge whether to comprise among the ULMAP of this frame and insert IE at random, if have, then represent to comprise Random Access Channel in the sub-frame of uplink of this frame, BS determines Random Access Channel according to the described IE that inserts at random, and this IE stored, carry out third step then; If do not have, then carry out second step.
Second step: the RRAI byte of controlling prefix (DLFP) according to the descending sub frame of this radio frames determines whether the sub-frame of uplink of this radio frames comprises Random Access Channel, if RRAI is 00 (not changing DLFP), the sub-frame of uplink of then representing this radio frames does not comprise Random Access Channel, realizes the access of SS according to existing mode; Otherwise utilize received the last time stored insert the Random Access Channel (comprising that RRAI is 10,01,11 situation) that IE determines sub-frame of uplink at random.
Third step: SS inserts the Random Access Channel of the sub-frame of uplink of determining.
If because the abominable reason of channel circumstance, SS does not correctly receive ULMAP, SS should think that accidental channel last time of storage distributes IE to lose efficacy, and should delete.Accordingly, when determining Random Access Channel,, then there is not Random Access Channel to handle according to present frame if the IE of access at random that not store this moment as a reference as if the IE of access at random that received in the last time that the second step utilization has been stored.
Among first top embodiment, whether RRAI is used to refer to whether be assigned Random Access Channel in the radio frames, in addition, also can indicate to include in the current wireless frame with RRAI and insert IE at random, rather than be used to refer to Random Access Channel.Corresponding to table 1, the connotation of the field of RRAI is revised as the content shown in the following table 2:
| RRAI(Ranging_Region_ Allocation_Indication) | 2 | Bit #0：When Set，Initial Ranging Region IE is sent. Bit #1：When Set，Periodical Ranging Region IE is sent. |
Table 2
Therefore, only when RRAI=00, do not comprise in the expression current wireless frame and insert IE at random.Below this second embodiment is described.
Whether the current wireless frame comprises the primitive rule that inserts IE at random: as long as present frame the and last time channel allocation of frame was inequality, then carry and insert IE at random, and indicate this radio frames to carry with RRAI and insert IE at random, otherwise, this radio frames is not carried and is inserted IE at random, and indicates this radio frames not carry with RRAI and insert IE at random.Referring to the rule among first embodiment 3, according to this rule, BS carries out accidental channel and divides timing, may further comprise the steps simultaneously:
First step: if the Random Access Channel of present frame is distributed and the Random Access Channel of former frame is distributed just the same, and present frame sends from last time and inserted at random between the frame of IE, be no more than the T time, then present frame can not send the corresponding IE of access at random; Otherwise need to send the corresponding IE of access at random.
Second step: indicate present frame whether to comprise at the RRAI that DLFP comprised of present frame and insert IE at random.
The distribution method of the Random Access Channel that corresponding correspondence is above-mentioned when SS carries out the access of wireless access channel, may further comprise the steps:
Whether first step: SS at first determines to comprise in the present frame according to the RRAI in the DLFP frame and inserts IE at random;
Insert IE (comprising that RRAI is 10,01,11 situation) at random if having among the ULMAP of present frame, then determine Random Access Channel in the current sub-frame of uplink, and write down this Random Access Channel distribution condition, as later reference according to this IE;
If do not insert IE (RRAI is 00) at random among the ULMAP in the present frame, then utilize the Random Access Channel distribution condition of the last time of having stored to determine Random Access Channel.
Second step: SS inserts the Random Access Channel of the sub-frame of uplink of determining.
If because the abominable reason of channel circumstance, SS does not correctly receive ULMAP, SS should think that accidental channel distribution condition last time of storage lost efficacy, and should delete.Accordingly, if when the Random Access Channel distribution condition of the last time of having stored is determined Random Access Channel, be reference if do not have the corresponding contents of storage this moment, then there is not Random Access Channel to handle according to present frame.
Sum up above-mentioned two embodiment, as follows:
Embodiment for table 1 correspondence: what reservation bit RRAI represented is whether present frame distributes Random Access Channel, has perhaps distributed Random Access Channel, does not insert IE at random but do not send;
And among the embodiment of table 2 correspondence, whether reservation bit RRAI has comprised in the expression present frame to insert IE at random, does not perhaps distribute Random Access Channel, inserts IE at random but have.
The difference of two kinds of schemes is:
The embodiment of table 1 correspondence: be the IE of access at random of primary distribution before the record, if do not distribute, just no matter; If change, just send new IE corrigendum.If former frame is distributed accidental channel, but present frame does not have allocated channel, present frame also need not send and insert IE at random.
The embodiment of table 2 correspondence: be the Random Access Channel distribution condition of record former frame, comprise whether distributing.If former frame is distributed accidental channel, present frame is allocated channel not, also will send and insert IE at random, and notice SS does not distribute Random Access Channel.Promptly, the Random Access Channel of present frame inserts IE at random as long as changing to send.
The difference that shows when sending radio frames specific as follows, wherein A represents 8 radio frames from left to right sending successively to B, and the accidental channel of different letter representation different frames distributes, and " O " represents not distribute Random Access Channel."Yes" represents that the needs transmission inserts IE at random, and "No" do not need to represent transmission to insert IE at random.Show below whether will carry when sending radio frames and insert IE at random:
Radio frames Random Access Channel distribution condition A O O O A O O B
Whether whether the embodiment of table 1 correspondence is carrying is inserted IE at random: be not
Whether whether whether the embodiment of table 2 correspondence is carrying is inserted IE at random: be not to be
By two top embodiment as can be seen, when BS sends radio frames, if the Random Access Channel of present frame and frame last time is identical, and in certain time interval, then in ULMAP, can save and insert the IE field at random, and adopt the reserved field among the DLFP to represent whether this frame comprises Random Access Channel.Use this radio frames to send and to solve the redundancy that inserts IE at random, saved radio channel resource.Accordingly, when SS receives corresponding radio frames, when determining this frame and comprise Random Access Channel, adopt its IE of access at random that time receives recently to determine Random Access Channel and insert according to the reserved field among the DLFP.Guaranteed to use above-mentioned radio frames to realize the access of wireless channel.
In addition, above described embodiment adopted the reserve bytes of DLFP, adopt reserve bytes can realize minimum influence to existing protocol, to realize maximum and compatibility existing protocol, be a preferred embodiment.Be understood that, also can adopt among the DLFP other byte (as other bytes or increase new byte etc.), perhaps adopt the reserve bytes or the non-reserve bytes of other fields (non-DLFP), can realize the present invention equally.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (18)
1, a kind of distribution method of Random Access Channel is characterized in that, this method may further comprise the steps:
A 1, judge whether to the sub-frame of uplink of current wireless frame distributes Random Access Channel, if, execution in step B1 then;
If not, then be provided with among the uplink map ULMAP of current wireless frame and do not comprise the cell of the access at random IE that is used to indicate described Random Access Channel, and a specified byte in the present frame is set represents that the sub-frame of uplink of this radio frames is unallocated Random Access Channel, execution in step C1 arranged;
B1, judge whether the Random Access Channel of the current wireless frame and the sub-frame of uplink of radio frames last time is identical, if not, then be provided with among the ULMAP of current wireless frame and comprise the described IE that inserts at random;
If then be provided with among the uplink map ULMAP of current wireless frame and do not comprise the IE of access at random that is used to indicate described Random Access Channel, and specified byte described in the present frame is set represents that the sub-frame of uplink of this radio frames is assigned Random Access Channel;
C1, the radio frames that sets is sent by wireless channel.
2, method according to claim 1 is characterized in that, when the Random Access Channel of the described judgement current wireless of the step B1 frame and the sub-frame of uplink of radio frames last time is identical, further comprises:
Whether the time interval that judge to send the current wireless frame and send radio frames last time is in the effective time of setting, if then continue current step;
Otherwise, be provided with among the ULMAP of current wireless frame and comprise described IE, the execution in step C1 of inserting at random.
3, method according to claim 1 is characterized in that, described specified byte adopts different values to represent the following different situations of the sub-frame of uplink of current wireless frame respectively:
Unallocated Random Access Channel;
Only distributed the Random Access Channel that is used for periodically adjustment or bandwidth request;
Only distributed the Random Access Channel that is used for initial random access;
Promptly distributed the Random Access Channel that is used for initial random access to distribute again to be used for and periodically adjusted or the Random Access Channel of bandwidth request.
According to claim 1 or 3 described methods, it is characterized in that 4, described specified byte is the byte among the DLEP.
5, method according to claim 4 is characterized in that, the byte among the described DLEP is two bits of the reserve bytes of DLEP.
6, a kind of cut-in method of Random Access Channel, SS receives the radio frames of BS, it is characterized in that this method may further comprise the steps:
Whether comprise among the ULMAP of the radio frames that A6, judgement receive and insert IE at random, if not, execution in step B6; If, then insert the Random Access Channel that IE determines the sub-frame of uplink of this radio frames at random according to described, and buffer memory this insert IE, execution in step C6 at random;
B6, judge whether the specified byte in the present frame represents that the sub-frame of uplink of this radio frames is assigned Random Access Channel, if then insert the Random Access Channel that IE determines the sub-frame of uplink of current wireless frame at random according to buffer memory; Otherwise process ends;
C6, SS are with in the described Random Access Channel access wireless channel of determining.
7, method according to claim 6 is characterized in that,
The Random Access Channel that this radio frames sub-frame of uplink that described specified byte is represented distributes is: the Random Access Channel that is used for periodically adjustment or bandwidth request; The IE of access at random of described buffer memory is: indication is used for the IE of access at random of the Random Access Channel of periodically adjustment or bandwidth request; Perhaps,
The Random Access Channel that this radio frames sub-frame of uplink that described specified byte is represented distributes is: the Random Access Channel that is used for initial random access; The IE of access at random of described buffer memory is: indication is used for the IE of access at random of the Random Access Channel of initial random access; Perhaps,
The Random Access Channel that this radio frames sub-frame of uplink that described specified byte is represented distributes is: be used for the Random Access Channel of initial random access and be used for periodically adjusting or the Random Access Channel of bandwidth request; The IE of access at random of described buffer memory is: indication be used for initial random access Random Access Channel insert at random that IE and indication are used for periodically adjusting or the IE of access at random of the Random Access Channel of bandwidth request.
According to claim 6 or 7 described methods, it is characterized in that 8, described specified byte is the byte among the DLFP.
9, method according to claim 8 is characterized in that, the byte among the described DLFP is two bits of the reserve bytes that comprises of DLFP.
10, method according to claim 6, it is characterized in that, if the IE of access at random of buffer memory lost efficacy, step B6 is described during according to the inserting IE at random and determine the Random Access Channel of sub-frame of uplink of current wireless frame of buffer memory, handles according to the situation of the unallocated Random Access Channel of current wireless frame.
11, a kind of distribution method of Random Access Channel is characterized in that, this method may further comprise the steps:
A11, judge whether the Random Access Channel of the sub-frame of uplink that current wireless frame and radio frames are last time distributed is identical, if the IE of access at random that does not comprise described Random Access Channel correspondence among the ULMAP of current wireless frame then is set; Otherwise comprise the described IE that inserts at random;
B 11, according to the setting of steps A 11, the specified byte in the corresponding setting current wireless frame represents whether to comprise the described IE that inserts at random;
C11, the radio frames that sets is sent by wireless channel.
12, method according to claim 11 is characterized in that, when the Random Access Channel of the steps A 11 described judgement current wireless frames and the sub-frame of uplink of radio frames last time is identical, further comprises:
Whether the time interval that judge to send the current wireless frame and send radio frames last time is in the effective time of setting, if then continue current step; Otherwise be provided with among the ULMAP of current wireless frame and comprise described IE, the execution in step B11 of inserting at random.
13, method according to claim 11 is characterized in that, described specified byte is the byte among the DLFP.
14, method according to claim 13 is characterized in that, the byte among the described DLFP is the reserve bytes that DLFP comprises.
15, a kind of cut-in method of Random Access Channel, SS receives the radio frames of BS, it is characterized in that this method may further comprise the steps:
A15, judge whether to comprise in this radio frames according to the specified byte of present frame and insert IE at random;
If then insert IE at random and determine Random Access Channel in the current sub-frame of uplink and this Random Access Channel distribution condition of buffer memory according to this;
If not, then utilize the Random Access Channel distribution condition of buffer memory to determine Random Access Channel;
B15, SS are with in the described Random Access Channel access wireless channel of determining.
16, method according to claim 15, it is characterized in that, if the Random Access Channel distribution condition of buffer memory lost efficacy, when steps A 15 described Random Access Channel distribution condition according to buffer memory are determined the Random Access Channel of sub-frame of uplink of current wireless frame, handle according to the situation of the unallocated Random Access Channel of current wireless frame.
17, method according to claim 15 is characterized in that, described specified byte is the byte among the DLFP.
18, method according to claim 17 is characterized in that, the byte among the described DLFP is the reserve bytes that DLFP comprises.
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